“It’s not ideal,” said David MacNaughton, the former Canadian ambassador to the U.S. who helped renegotiate the North American Free Trade Agreement during Trump’s first term. “Trump is ...

Trump has threatened to impose tariffs on all Canadian products unless Canada curbs what he claims is a flow of migrants and drugs into the U.S.

Canada’s Ambassador to the United States Kirsten Hillman, former ambassador David MacNaughton and Jody Thomas, the prime minister’s former national security adviser, are also joining the council.

"The resignation means there is now very little that Trudeau can do now to stave off Trump's tariff threat," former Canadian ambassador to the US David MacNaughton told CBC News on Monday.